/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  package org.apache.bcel.classfile;
  
  import java.io.ByteArrayOutputStream;
  import java.io.DataOutputStream;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Objects;
  import java.util.Set;
  import java.util.StringTokenizer;
  import java.util.TreeSet;
  
  import org.apache.bcel.Const;
  import org.apache.bcel.generic.Type;
  import org.apache.bcel.util.BCELComparator;
  import org.apache.bcel.util.ClassQueue;
  import org.apache.bcel.util.SyntheticRepository;
  import org.apache.commons.lang3.ArrayUtils;
  
  /**
   * Represents a Java class, i.e., the data structures, constant pool, fields, methods and commands contained in a Java
   * .class file. See <a href="https://docs.oracle.com/javase/specs/">JVM specification</a> for details. The intent of
   * this class is to represent a parsed or otherwise existing class file. Those interested in programmatically generating
   * classes should see the <a href="../generic/ClassGen.html">ClassGen</a> class.
   *
   * @see org.apache.bcel.generic.ClassGen
   */
  public class JavaClass extends AccessFlags implements Cloneable, Node, Comparable<JavaClass> {
  
      /**
       * The standard class file extension.
       *
       * @since 6.7.0
       */
      public static final String EXTENSION = ".class";
  
      /**
       * Empty array.
       *
       * @since 6.6.0
       */
      public static final JavaClass[] EMPTY_ARRAY = {};
  
      public static final byte HEAP = 1;
      public static final byte FILE = 2;
      public static final byte ZIP = 3;
      private static final boolean debug = Boolean.getBoolean("JavaClass.debug"); // Debugging on/off
  
      private static BCELComparator<JavaClass> bcelComparator = new BCELComparator<JavaClass>() {
  
          @Override
          public boolean equals(final JavaClass a, final JavaClass b) {
              return a == b || a != null && b != null && Objects.equals(a.getClassName(), b.getClassName());
          }
  
          @Override
          public int hashCode(final JavaClass o) {
              return o != null ? Objects.hashCode(o.getClassName()) : 0;
          }
      };
  
      /*
       * Print debug information depending on 'JavaClass.debug'
       */
      static void Debug(final String str) {
          if (debug) {
              System.out.println(str);
          }
      }
  
      /**
       * @return Comparison strategy object.
       */
      public static BCELComparator<JavaClass> getComparator() {
          return bcelComparator;
      }
  
      private static String indent(final Object obj) {
          final StringTokenizer tokenizer = new StringTokenizer(obj.toString(), "\n");
         final StringBuilder buf = new StringBuilder();
         while (tokenizer.hasMoreTokens()) {
             buf.append("\t").append(tokenizer.nextToken()).append("\n");
         }
         return buf.toString();
     }
 
     /**
      * @param comparator Comparison strategy object.
      */
     public static void setComparator(final BCELComparator<JavaClass> comparator) {
         bcelComparator = comparator;
     }
 
     private String fileName;
     private final String packageName;
     private String sourceFileName = "<Unknown>";
     private int classNameIndex;
     private int superclassNameIndex;
     private String className;
     private String superclassName;
     private int major;
     private int minor; // Compiler version
     private ConstantPool constantPool; // Constant pool
     private int[] interfaces; // implemented interfaces
     private String[] interfaceNames;
     private Field[] fields; // Fields, i.e., variables of class
     private Method[] methods; // methods defined in the class
     private Attribute[] attributes; // attributes defined in the class
 
     private AnnotationEntry[] annotations; // annotations defined on the class
     private byte source = HEAP; // Generated in memory
 
     private boolean isAnonymous;
 
     private boolean isNested;
     private boolean isRecord;
 
     private boolean computedNestedTypeStatus;
     private boolean computedRecord;
 
     /**
      * In cases where we go ahead and create something, use the default SyntheticRepository, because we don't know any
      * better.
      */
     private transient org.apache.bcel.util.Repository repository = SyntheticRepository.getInstance();
 
     /**
      * Constructor gets all contents as arguments.
      *
      * @param classNameIndex Class name
      * @param superclassNameIndex Superclass name
      * @param fileName File name
      * @param major Major compiler version
      * @param minor Minor compiler version
      * @param accessFlags Access rights defined by bit flags
      * @param constantPool Array of constants
      * @param interfaces Implemented interfaces
      * @param fields Class fields
      * @param methods Class methods
      * @param attributes Class attributes
      */
     public JavaClass(final int classNameIndex, final int superclassNameIndex, final String fileName, final int major, final int minor, final int accessFlags,
         final ConstantPool constantPool, final int[] interfaces, final Field[] fields, final Method[] methods, final Attribute[] attributes) {
         this(classNameIndex, superclassNameIndex, fileName, major, minor, accessFlags, constantPool, interfaces, fields, methods, attributes, HEAP);
     }
 
     /**
      * Constructor gets all contents as arguments.
      *
      * @param classNameIndex Index into constant pool referencing a ConstantClass that represents this class.
      * @param superclassNameIndex Index into constant pool referencing a ConstantClass that represents this class's
      *        superclass.
      * @param fileName File name
      * @param major Major compiler version
      * @param minor Minor compiler version
      * @param accessFlags Access rights defined by bit flags
      * @param constantPool Array of constants
      * @param interfaces Implemented interfaces
      * @param fields Class fields
      * @param methods Class methods
      * @param attributes Class attributes
      * @param source Read from file or generated in memory?
      */
     public JavaClass(final int classNameIndex, final int superclassNameIndex, final String fileName, final int major, final int minor, final int accessFlags,
         final ConstantPool constantPool, int[] interfaces, Field[] fields, Method[] methods, Attribute[] attributes, final byte source) {
         super(accessFlags);
         interfaces = ArrayUtils.nullToEmpty(interfaces);
         if (attributes == null) {
             attributes = Attribute.EMPTY_ARRAY;
         }
         if (fields == null) {
             fields = Field.EMPTY_ARRAY;
         }
         if (methods == null) {
             methods = Method.EMPTY_ARRAY;
         }
         this.classNameIndex = classNameIndex;
         this.superclassNameIndex = superclassNameIndex;
         this.fileName = fileName;
         this.major = major;
         this.minor = minor;
         this.constantPool = constantPool;
         this.interfaces = interfaces;
         this.fields = fields;
         this.methods = methods;
         this.attributes = attributes;
         this.source = source;
         // Get source file name if available
         for (final Attribute attribute : attributes) {
             if (attribute instanceof SourceFile) {
                 sourceFileName = ((SourceFile) attribute).getSourceFileName();
                 break;
             }
         }
         /*
          * According to the specification the following entries must be of type 'ConstantClass' but we check that anyway via the
          * 'ConstPool.getConstant' method.
          */
         className = constantPool.getConstantString(classNameIndex, Const.CONSTANT_Class);
         className = Utility.compactClassName(className, false);
         final int index = className.lastIndexOf('.');
         if (index < 0) {
             packageName = "";
         } else {
             packageName = className.substring(0, index);
         }
         if (superclassNameIndex > 0) {
             // May be zero -> class is java.lang.Object
             superclassName = constantPool.getConstantString(superclassNameIndex, Const.CONSTANT_Class);
             superclassName = Utility.compactClassName(superclassName, false);
         } else {
             superclassName = "java.lang.Object";
         }
         interfaceNames = new String[interfaces.length];
         for (int i = 0; i < interfaces.length; i++) {
             final String str = constantPool.getConstantString(interfaces[i], Const.CONSTANT_Class);
             interfaceNames[i] = Utility.compactClassName(str, false);
         }
     }
 
     /**
      * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
      * I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
      *
      * @param v Visitor object
      */
     @Override
     public void accept(final Visitor v) {
         v.visitJavaClass(this);
     }
 
     /**
      * Return the natural ordering of two JavaClasses. This ordering is based on the class name
      *
      * @since 6.0
      */
     @Override
     public int compareTo(final JavaClass obj) {
         return getClassName().compareTo(obj.getClassName());
     }
 
     private void computeIsRecord() {
         if (computedRecord) {
             return;
         }
         for (final Attribute attribute : this.attributes) {
             if (attribute instanceof Record) {
                 isRecord = true;
                 break;
             }
         }
         this.computedRecord = true;
     }
 
     private void computeNestedTypeStatus() {
         if (computedNestedTypeStatus) {
             return;
         }
         for (final Attribute attribute : this.attributes) {
             if (attribute instanceof InnerClasses) {
                 ((InnerClasses) attribute).forEach(innerClass ->  {
                     boolean innerClassAttributeRefersToMe = false;
                     String innerClassName = constantPool.getConstantString(innerClass.getInnerClassIndex(), Const.CONSTANT_Class);
                     innerClassName = Utility.compactClassName(innerClassName, false);
                     if (innerClassName.equals(getClassName())) {
                         innerClassAttributeRefersToMe = true;
                     }
                     if (innerClassAttributeRefersToMe) {
                         this.isNested = true;
                         if (innerClass.getInnerNameIndex() == 0) {
                             this.isAnonymous = true;
                         }
                     }
                 });
             }
         }
         this.computedNestedTypeStatus = true;
     }
 
     /**
      * @return deep copy of this class
      */
     public JavaClass copy() {
         try {
             final JavaClass c = (JavaClass) clone();
             c.constantPool = constantPool.copy();
             c.interfaces = interfaces.clone();
             c.interfaceNames = interfaceNames.clone();
             c.fields = new Field[fields.length];
             Arrays.setAll(c.fields, i -> fields[i].copy(c.constantPool));
             c.methods = new Method[methods.length];
             Arrays.setAll(c.methods, i -> methods[i].copy(c.constantPool));
             c.attributes = new Attribute[attributes.length];
             Arrays.setAll(c.attributes, i -> attributes[i].copy(c.constantPool));
             return c;
         } catch (final CloneNotSupportedException e) {
             return null;
         }
     }
 
     /**
      * Dump Java class to output stream in binary format.
      *
      * @param file Output stream
      * @throws IOException if an I/O error occurs.
      */
     public void dump(final DataOutputStream file) throws IOException {
         file.writeInt(Const.JVM_CLASSFILE_MAGIC);
         file.writeShort(minor);
         file.writeShort(major);
         constantPool.dump(file);
         file.writeShort(super.getAccessFlags());
         file.writeShort(classNameIndex);
         file.writeShort(superclassNameIndex);
         file.writeShort(interfaces.length);
         for (final int interface1 : interfaces) {
             file.writeShort(interface1);
         }
         file.writeShort(fields.length);
         for (final Field field : fields) {
             field.dump(file);
         }
         file.writeShort(methods.length);
         for (final Method method : methods) {
             method.dump(file);
         }
         if (attributes != null) {
             file.writeShort(attributes.length);
             for (final Attribute attribute : attributes) {
                 attribute.dump(file);
             }
         } else {
             file.writeShort(0);
         }
         file.flush();
     }
 
     /**
      * Dump class to a file.
      *
      * @param file Output file
      * @throws IOException if an I/O error occurs.
      */
     public void dump(final File file) throws IOException {
         final String parent = file.getParent();
         if (parent != null) {
             final File dir = new File(parent);
             if (!dir.mkdirs() && !dir.isDirectory()) {
                 throw new IOException("Could not create the directory " + dir);
             }
         }
         try (DataOutputStream dos = new DataOutputStream(new FileOutputStream(file))) {
             dump(dos);
         }
     }
 
     /**
      * Dump Java class to output stream in binary format.
      *
      * @param file Output stream
      * @throws IOException if an I/O error occurs.
      */
     public void dump(final OutputStream file) throws IOException {
         dump(new DataOutputStream(file));
     }
 
     /**
      * Dump class to a file named fileName.
      *
      * @param fileName Output file name
      * @throws IOException if an I/O error occurs.
      */
     public void dump(final String fileName) throws IOException {
         dump(new File(fileName));
     }
 
     /**
      * Return value as defined by given BCELComparator strategy. By default two JavaClass objects are said to be equal when
      * their class names are equal.
      *
      * @see Object#equals(Object)
      */
     @Override
     public boolean equals(final Object obj) {
         return obj instanceof JavaClass && bcelComparator.equals(this, (JavaClass) obj);
     }
 
     /**
      * Finds a visible field by name and type in this class and its super classes.
      * @param fieldName the field name to find
      * @param fieldType the field type to find
      * @return field matching given name and type, null if field is not found or not accessible from this class.
      * @throws ClassNotFoundException
      * @since 6.8.0
      */
     public Field findField(final String fieldName, final Type fieldType) throws ClassNotFoundException {
         for (final Field field : fields) {
             if (field.getName().equals(fieldName)) {
                 final Type fType = Type.getType(field.getSignature());
                 /*
                  * TODO: Check if assignment compatibility is sufficient. What does Sun do?
                  */
                 if (fType.equals(fieldType)) {
                     return field;
                 }
             }
         }
 
         final JavaClass superclass = getSuperClass();
         if (superclass != null && !"java.lang.Object".equals(superclass.getClassName())) {
             final Field f = superclass.findField(fieldName, fieldType);
             if (f != null && (f.isPublic() || f.isProtected() || !f.isPrivate() && packageName.equals(superclass.getPackageName()))) {
                 return f;
             }
         }
         final JavaClass[] implementedInterfaces = getInterfaces();
         if (implementedInterfaces != null) {
             for (final JavaClass implementedInterface : implementedInterfaces) {
                 final Field f = implementedInterface.findField(fieldName, fieldType);
                 if (f != null) {
                     return f;
                 }
             }
         }
         return null;
     }
 
     /**
      * Gets all interfaces implemented by this JavaClass (transitively).
      *
      * @throws ClassNotFoundException if any of the class's superclasses or interfaces can't be found.
      */
     public JavaClass[] getAllInterfaces() throws ClassNotFoundException {
         final ClassQueue queue = new ClassQueue();
         final Set<JavaClass> allInterfaces = new TreeSet<>();
         queue.enqueue(this);
         while (!queue.empty()) {
             final JavaClass clazz = queue.dequeue();
             final JavaClass souper = clazz.getSuperClass();
             final JavaClass[] interfaces = clazz.getInterfaces();
             if (clazz.isInterface()) {
                 allInterfaces.add(clazz);
             } else if (souper != null) {
                 queue.enqueue(souper);
             }
             for (final JavaClass iface : interfaces) {
                 queue.enqueue(iface);
             }
         }
         return allInterfaces.toArray(JavaClass.EMPTY_ARRAY);
     }
 
     /**
      * @return Annotations on the class
      * @since 6.0
      */
     public AnnotationEntry[] getAnnotationEntries() {
         if (annotations == null) {
             annotations = AnnotationEntry.createAnnotationEntries(getAttributes());
         }
 
         return annotations;
     }
 
     /**
      * @return Attributes of the class.
      */
     public Attribute[] getAttributes() {
         return attributes;
     }
 
     /**
      * @return class in binary format
      */
     public byte[] getBytes() {
         final ByteArrayOutputStream baos = new ByteArrayOutputStream();
         try (DataOutputStream dos = new DataOutputStream(baos)) {
             dump(dos);
         } catch (final IOException e) {
             e.printStackTrace();
         }
         return baos.toByteArray();
     }
 
     /**
      * @return Class name.
      */
     public String getClassName() {
         return className;
     }
 
     /**
      * @return Class name index.
      */
     public int getClassNameIndex() {
         return classNameIndex;
     }
 
     /**
      * @return Constant pool.
      */
     public ConstantPool getConstantPool() {
         return constantPool;
     }
 
     /**
      * @return Fields, i.e., variables of the class. Like the JVM spec mandates for the classfile format, these fields are
      *         those specific to this class, and not those of the superclass or superinterfaces.
      */
     public Field[] getFields() {
         return fields;
     }
 
     /**
      * @return File name of class, aka SourceFile attribute value
      */
     public String getFileName() {
         return fileName;
     }
 
     /**
      * @return Indices in constant pool of implemented interfaces.
      */
     public int[] getInterfaceIndices() {
         return interfaces;
     }
 
     /**
      * @return Names of implemented interfaces.
      */
     public String[] getInterfaceNames() {
         return interfaceNames;
     }
 
     /**
      * Gets interfaces directly implemented by this JavaClass.
      *
      * @throws ClassNotFoundException if any of the class's interfaces can't be found.
      */
     public JavaClass[] getInterfaces() throws ClassNotFoundException {
         final String[] interfaces = getInterfaceNames();
         final JavaClass[] classes = new JavaClass[interfaces.length];
         for (int i = 0; i < interfaces.length; i++) {
             classes[i] = repository.loadClass(interfaces[i]);
         }
         return classes;
     }
 
     /**
      * @return Major number of class file version.
      */
     public int getMajor() {
         return major;
     }
 
     /**
      * @return A {@link Method} corresponding to java.lang.reflect.Method if any
      */
     public Method getMethod(final java.lang.reflect.Method m) {
         for (final Method method : methods) {
             if (m.getName().equals(method.getName()) && m.getModifiers() == method.getModifiers() && Type.getSignature(m).equals(method.getSignature())) {
                 return method;
             }
         }
         return null;
     }
 
     /**
      * @return Methods of the class.
      */
     public Method[] getMethods() {
         return methods;
     }
 
     /**
      * @return Minor number of class file version.
      */
     public int getMinor() {
         return minor;
     }
 
     /**
      * @return Package name.
      */
     public String getPackageName() {
         return packageName;
     }
 
     /**
      * Gets the ClassRepository which holds its definition. By default this is the same as
      * SyntheticRepository.getInstance();
      */
     public org.apache.bcel.util.Repository getRepository() {
         return repository;
     }
 
     /**
      * @return returns either HEAP (generated), FILE, or ZIP
      */
     public final byte getSource() {
         return source;
     }
 
     /**
      * @return file name where this class was read from
      */
     public String getSourceFileName() {
         return sourceFileName;
     }
 
     /**
      * Gets the source file path including the package path.
      *
      * @return path to original source file of parsed class, relative to original source directory.
      * @since 6.7.0
      */
     public String getSourceFilePath() {
         final StringBuilder outFileName = new StringBuilder();
         if (!packageName.isEmpty()) {
             outFileName.append(Utility.packageToPath(packageName));
             outFileName.append('/');
         }
         outFileName.append(sourceFileName);
         return outFileName.toString();
     }
 
     /**
      * @return the superclass for this JavaClass object, or null if this is {@link Object}
      * @throws ClassNotFoundException if the superclass can't be found
      */
     public JavaClass getSuperClass() throws ClassNotFoundException {
         if ("java.lang.Object".equals(getClassName())) {
             return null;
         }
         return repository.loadClass(getSuperclassName());
     }
 
     /**
      * @return list of super classes of this class in ascending order, i.e., java.lang.Object is always the last element
      * @throws ClassNotFoundException if any of the superclasses can't be found
      */
     public JavaClass[] getSuperClasses() throws ClassNotFoundException {
         JavaClass clazz = this;
         final List<JavaClass> allSuperClasses = new ArrayList<>();
         for (clazz = clazz.getSuperClass(); clazz != null; clazz = clazz.getSuperClass()) {
             allSuperClasses.add(clazz);
         }
         return allSuperClasses.toArray(JavaClass.EMPTY_ARRAY);
     }
 
     /**
      * returns the super class name of this class. In the case that this class is {@link Object}, it will return itself
      * ({@link Object}). This is probably incorrect but isn't fixed at this time to not break existing clients.
      *
      * @return Superclass name.
      */
     public String getSuperclassName() {
         return superclassName;
     }
 
     /**
      * @return Class name index.
      */
     public int getSuperclassNameIndex() {
         return superclassNameIndex;
     }
 
     /**
      * Return value as defined by given BCELComparator strategy. By default return the hash code of the class name.
      *
      * @see Object#hashCode()
      */
     @Override
     public int hashCode() {
         return bcelComparator.hashCode(this);
     }
 
     /**
      * @return true, if this class is an implementation of interface inter
      * @throws ClassNotFoundException if superclasses or superinterfaces of this class can't be found
      */
     public boolean implementationOf(final JavaClass inter) throws ClassNotFoundException {
         if (!inter.isInterface()) {
             throw new IllegalArgumentException(inter.getClassName() + " is no interface");
         }
         if (this.equals(inter)) {
             return true;
         }
         final JavaClass[] superInterfaces = getAllInterfaces();
         for (final JavaClass superInterface : superInterfaces) {
             if (superInterface.equals(inter)) {
                 return true;
             }
         }
         return false;
     }
 
     /**
      * Equivalent to runtime "instanceof" operator.
      *
      * @return true if this JavaClass is derived from the super class
      * @throws ClassNotFoundException if superclasses or superinterfaces of this object can't be found
      */
     public final boolean instanceOf(final JavaClass superclass) throws ClassNotFoundException {
         if (this.equals(superclass)) {
             return true;
         }
         for (final JavaClass clazz : getSuperClasses()) {
             if (clazz.equals(superclass)) {
                 return true;
             }
         }
         if (superclass.isInterface()) {
             return implementationOf(superclass);
         }
         return false;
     }
 
     /**
      * @since 6.0
      */
     public final boolean isAnonymous() {
         computeNestedTypeStatus();
         return this.isAnonymous;
     }
 
     public final boolean isClass() {
         return (super.getAccessFlags() & Const.ACC_INTERFACE) == 0;
     }
 
     /**
      * @since 6.0
      */
     public final boolean isNested() {
         computeNestedTypeStatus();
         return this.isNested;
     }
 
     /**
      * Tests whether this class was declared as a record
      *
      * @return true if a record attribute is present, false otherwise.
      * @since 6.9.0
      */
     public boolean isRecord() {
         computeIsRecord();
         return this.isRecord;
     }
 
     public final boolean isSuper() {
         return (super.getAccessFlags() & Const.ACC_SUPER) != 0;
     }
 
     /**
      * @param attributes .
      */
     public void setAttributes(final Attribute[] attributes) {
         this.attributes = attributes != null ? attributes : Attribute.EMPTY_ARRAY;
     }
 
     /**
      * @param className .
      */
     public void setClassName(final String className) {
         this.className = className;
     }
 
     /**
      * @param classNameIndex .
      */
     public void setClassNameIndex(final int classNameIndex) {
         this.classNameIndex = classNameIndex;
     }
 
     /**
      * @param constantPool .
      */
     public void setConstantPool(final ConstantPool constantPool) {
         this.constantPool = constantPool;
     }
 
     /**
      * @param fields .
      */
     public void setFields(final Field[] fields) {
         this.fields = fields != null ? fields : Field.EMPTY_ARRAY;
     }
 
     /**
      * Sets File name of class, aka SourceFile attribute value
      */
     public void setFileName(final String fileName) {
         this.fileName = fileName;
     }
 
     /**
      * @param interfaceNames .
      */
     public void setInterfaceNames(final String[] interfaceNames) {
         this.interfaceNames = ArrayUtils.nullToEmpty(interfaceNames);
     }
 
     /**
      * @param interfaces .
      */
     public void setInterfaces(final int[] interfaces) {
         this.interfaces = ArrayUtils.nullToEmpty(interfaces);
     }
 
     /**
      * @param major .
      */
     public void setMajor(final int major) {
         this.major = major;
     }
 
     /**
      * @param methods .
      */
     public void setMethods(final Method[] methods) {
         this.methods = methods != null ? methods : Method.EMPTY_ARRAY;
     }
 
     /**
      * @param minor .
      */
     public void setMinor(final int minor) {
         this.minor = minor;
     }
 
     /**
      * Sets the ClassRepository which loaded the JavaClass. Should be called immediately after parsing is done.
      */
     public void setRepository(final org.apache.bcel.util.Repository repository) { // TODO make protected?
         this.repository = repository;
     }
 
     /**
      * Sets absolute path to file this class was read from.
      */
     public void setSourceFileName(final String sourceFileName) {
         this.sourceFileName = sourceFileName;
     }
 
     /**
      * @param superclassName .
      */
     public void setSuperclassName(final String superclassName) {
         this.superclassName = superclassName;
     }
 
     /**
      * @param superclassNameIndex .
      */
     public void setSuperclassNameIndex(final int superclassNameIndex) {
         this.superclassNameIndex = superclassNameIndex;
     }
 
     /**
      * @return String representing class contents.
      */
     @Override
     public String toString() {
         String access = Utility.accessToString(super.getAccessFlags(), true);
         access = access.isEmpty() ? "" : access + " ";
         final StringBuilder buf = new StringBuilder(128);
         buf.append(access).append(Utility.classOrInterface(super.getAccessFlags())).append(" ").append(className).append(" extends ")
             .append(Utility.compactClassName(superclassName, false)).append('\n');
         final int size = interfaces.length;
         if (size > 0) {
             buf.append("implements\t\t");
             for (int i = 0; i < size; i++) {
                 buf.append(interfaceNames[i]);
                 if (i < size - 1) {
                     buf.append(", ");
                 }
             }
             buf.append('\n');
         }
         buf.append("file name\t\t").append(fileName).append('\n');
         buf.append("compiled from\t\t").append(sourceFileName).append('\n');
         buf.append("compiler version\t").append(major).append(".").append(minor).append('\n');
         buf.append("access flags\t\t").append(super.getAccessFlags()).append('\n');
         buf.append("constant pool\t\t").append(constantPool.getLength()).append(" entries\n");
         buf.append("ACC_SUPER flag\t\t").append(isSuper()).append("\n");
         if (attributes.length > 0) {
             buf.append("\nAttribute(s):\n");
             for (final Attribute attribute : attributes) {
                 buf.append(indent(attribute));
             }
         }
         final AnnotationEntry[] annotations = getAnnotationEntries();
         if (annotations != null && annotations.length > 0) {
             buf.append("\nAnnotation(s):\n");
             for (final AnnotationEntry annotation : annotations) {
                 buf.append(indent(annotation));
             }
         }
         if (fields.length > 0) {
             buf.append("\n").append(fields.length).append(" fields:\n");
             for (final Field field : fields) {
                 buf.append("\t").append(field).append('\n');
             }
         }
         if (methods.length > 0) {
             buf.append("\n").append(methods.length).append(" methods:\n");
             for (final Method method : methods) {
                 buf.append("\t").append(method).append('\n');
             }
         }
         return buf.toString();
     }
 }